Now that the config file is elsewhere and simpler, this outdated check can probably go.

etc/kaleidoscope-builder.conf

@@ -1,13 +1,6 @@
 ## NEEDS: LIBRARY, SKETCH, ROOT, SOURCEDIR
 ## Should be included when the current directory is the dir of the Sketch.
 
-case "$0" in
-    */settings.sh)
-        echo "This file must be included, never run directly!" >&2
-        exit 1
-        ;;
-esac
-
 SKETCH="${SKETCH:-${DEFAULT_SKETCH}}"
 LIBRARY="${LIBRARY:-${SKETCH}}"